motojoe

Take your thermostat out, it may not be working also bleed the system as you may have air cooling system.

Check your thermostat, make sure that it is not stuck, to check put it into hot water to see if it opens.

It appears that there is something wrong with either the carburetor or the fuel injection. If it is carburetor engine then the needle and seat is not sealing or your fuel pump is staying on. If it is fuel injected then your fuel pump is staying on when the engine is off. Either way make sure that your fuel pressure is fixed before you run the new engine or it will fail again.

Look at the "Man Hole" threads and you will find a cut into the threads, line this up to the flywheel timing marks and that will be your TDC.

Just for fun if your compression is as low as you say check the valve adjustments a tight valve could cause the loss of compression and also cause it not to start.

Replace your stator and it should come with a pickup coil. that should fix your problem.

It appears that you are missing the gear sector (picture #2) on your new part. For your new part you will need the "selector" that is made for your new part. Why not clean up your old part?

Check out the "Run Low on Oil" sender; make sure that it is plugged in and works. Sounds to me that something like the oil sender has a timer and is causing your machine to shut down.

Get the engine number off the engine block and Google it and it will tell you the manufacture of the engine. Then look up the proper way to time the engine.

Your inter clutch (wet Clutch) needs to be replaced.

Check and make sure all your wires are connected correctly, one of the safety switch wires is no connected.

It appears that your internal "wet clutch" has gone out.

On the Flywheel make sure that you are using the correct timing mark and have it on the case timing mark then make sure that you have the camshaft aligned correctly. Set your engine on top dead center and make sure the timing marks line up.

Does it have spark? If not then is most probably your stator. If it has spark then it is either your fuel injector is clogged, clean it with carb cleaner until you have a good stream of fuel; take off your air filter and spray starting fluid into the intake manifold try stating it; if it starts then it either your fuel pump or your fuel line. If it doesn't start then it is electrical (stator, ECU or a wire)

What is going on is your Stator's pick up coil is going bad. When your machine is idling there is a lot of heat building up and your stator's pickup coil is loosing connection and the your are not getting spark to the engine. Once the engine cools down the coil shrinks enough to make connection. Long story short replace your stator.